I did not test it but I'd bet that parallel decommision will lead to inconsistencies. Each decommission results in range movements and range reassignments which becomes effective after a successful decommission. If you start several decommissions at once, I guess the calculated reassignments are invalid for at least one node after the first node finished the decommission process.
I hope someone will correct me if i am wrong. 2017-04-11 18:43 GMT+02:00 Jacob Shadix <jacobsha...@gmail.com>: > Are you using vnodes? I typically do one-by-one as the decommission will > create additional load/network activity streaming data to the other nodes > as the token ranges are reassigned. > > -- Jacob Shadix > > On Sat, Apr 8, 2017 at 10:55 AM, Vlad <qa23d-...@yahoo.com> wrote: > >> Hi, >> >> how multiple nodes should be decommissioned by "nodetool decommission"- >> one by one or in parallel ? >> >> Thanks. >> > >
